Producing amino-anthraquinones and derivatives thereof.



To all whom it may concern n'r ST TET F F ml.

CHRISTIAN RAMPINI. DECEAS D, BY WILLIAM E. WARLAND, ADMINISTRATOR, 0F

BROOKLYN, YORK, ASSIGNOR TO BADISCHIE ANILIN &, LUDWIGSHAFEN-ON-THE-RHINE, GERMANY.

PRODUCING AMINO-ANTHRAQUINONES A'Nil) DERIVATIVES THEE OF.

1,063,172. No Drawing".

' .TIAN RAMPINI did invent newand useful Improvements in Producing Amino-Anthraquinones and-Derivatives Thereof, of which the following is a specification.

It has been discovered that substituted alpha-amino-anthraquinones, substituted in the amino group, can be obtained smoothly and in good yield by heating an. alphaanthraquinone-sulfonic acid with an organic amin in the presence of water and of an oxidizing agent which does not attack the amine compound under the conditions existing during the process. As' instances of suitable oxidizing agents may be mentioned manganese peroxid, cnprous oxid, cupric oxid, a

' bichromate, arsenic oxid and .silver. oxid.

According to the process of the'prese'nt invention, substituted alpha-amino-anthraqninones can beobtained in much better yield and in purer form than is the. case when no oxidizing agent is employed during the reaction. 7

The following examples will serve. to illustrate further the nature of this inven ion, which, however, is not confined to these examples. The parts are by weight.

Example 1: llcat together, for from 5 to 6 hours, at 150 C. in an autoclave provided with a stirrer, 100 parts of the potassimn salt of anthraquinonc'alpha-sulfonic acid, (300 parts of a (3 percent. monomethylamin solution, and 13 parts of potassium bromale. The alpha-methylaiiiilm-:mthratp inone is obtained in a crystah. n form and is very Specification of Letters Patent. Application filed March 1-5, 1912. Serial No.- 684,081:

Patented May 2'7, i913.

pure. It isfiltered off and washed with water. In this example the potassiumbromate can be replaced by the corresponding quantity of manganese dioxid.

SODA FABRIK, (IE-- Example '2: Heat together for'from 10,;

to 15 hours, in an autoclave at about'200 C., 75 parts of anilin, 75 parts of water, 20 parts of the potassium salt of anthraquinone-l-sulfonic acid and three parts of potassium bromate. \Vhen the reaction mixture is cold, add 500 to 1,000 parts of water,

acidity with hydrochloric acid, filter off the.

1-anilido-anthraquinone, wash it with. water anddry it. It is identical with the compound obtained by boiling 1nit-ro anthraquinone with 'anilin.

Now what is claimed-is:

'1. The process of producing alpha-aminoanthraquinones substituted in the amino group, by heating alpha-anthraquinone-sultonic acids with organic a'mins 1n he presence of water and of an oxidizing agent.

2. Ihe process of producing alpha-methylamino-anthraquinone by heating anthraquinone-alpha-sulfonic acid with nionomethylamin in the presence of water and in the presence of an oxidizing agent;

3. The process of producing alpha-methylamino anthraquinone by heating anthraquinone alpha sulfonic acid with "monomethylamin in the presence of water and in the presence of potassil-in HOIHtllt.

In testimony whereof I have hereunto set my hand in the presence of two subscribing w itnesses.

\VILLIAM E. VARLAND,

.-l.s utlministmior of Christian Ram/pint, de 

